Steve Bannon's political operation to help rightwing populists triumph in next year's European parliamentary elections is in disarray after he conceded that his campaign efforts could be illegal in most of the countries in which he planned to intervene. The former chief strategist to Donald Trump has spent months trying to recruit European parties to his Brussels-based group, the Movement, which he promised would operate as kind of a political consultancy for like-minded parties campaigning in the bloc-wide vote in May 2019. But the Guardian has established that Bannon would be barred or prevented from doing any meaningful work in nine of the 13 countries in which he is seeking to campaign. Bannon's intervention in European politics comes amid heightened sensitivity about foreign involvement in elections. Questions have been mounting over the scale of Russia's influence over the 2016 US presidential campaign and the UK's referendum to leave the EU. Bannon ... has pledged to spend millions of dollars to provide nativist and ultra-conservative European parties free access to specialised polling data, analytics, social media advice and help with candidate selection. But officials working on electoral law and independent experts in multiple countries said this kind of assistance would be ... banned in France, Spain, Poland, Czech Republic, Hungary and Finland.